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    <title>P155 7.2.3 【案例】改变盒子大小</title>
    <style>
        .box {
            width: 50px;
            height: 50px;
            background: #eee;
            margin: 0 auto;
        }
    </style>
</head>

<body>
    <div class="box" id="box"></div>
    <script>
        var box = document.getElementById('box');
        var i = 0;
        box.onclick = function () {
            ++i;
            if (i % 2) {
                this.style.width = '200px';
                this.style.height = '200px';
                this.innerHTML = '大';
            } else {
                this.style.width = '50px';
                this.style.height = '50px';
                this.innerHTML = '小';
            }
        };
    </script>
    <a href="../首页/page07.html">
        <h2>返回上一页面</h2>
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